Fix compilation without the extra syn features

Author: ogoffart

qmetaobject_impl/src/qrc_impl.rs

@@ -25,7 +25,6 @@ use syn::parse::{Parse, ParseStream, Result};
 use syn::{Ident, LitStr, Token, Visibility};
 
 /// Function with this name and visibility modifier will be generated by the `qrc!` macro.
-#[derive(Debug)]
 struct TargetFunc {
     vis: Visibility,
     ident: Ident,